Well, if you have life insurance that constitutes insurance fraud. If you have people that care about you (and its probably safe to say virtually everyone does), you have just done a lot of harm to them. If you have responsibilities, this probably means you are abandoning them.
If you succeeded in faking your death (very hard to do in modern society, I would suspect) you may gain some benefit from it, but you will cause problems for a lot of other people. Not to mention the problems you bring on yourself if you are caught could be very substantial.
(I thought it was a funny post though, even if attached to a serious topic. In all seriousness, if you are having suicidal thoughts, seek help.)
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